Granted Patent
Utility
US 4,876,018 · App. 07/145,434
Use of organic fluorochemical compounds with oleophobic and hydrophobic groups in asphaltenic crude oils as viscosity reducing agents
Inventor:
Athanasios Karydas
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Jan 19, 1988
Inventor
Athanasios Karydas
Assignee (at issue)
Ciba-Geigy
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.